The problem I see with going with these types of locking devices, is that's it's already hard enough to get a good "bit" on them to torque them tightly, and now if you use one of these clips or locking tabs, that takes away even more "meat" on the bolt head to use.

Just drill them and safety wire them. Just tie two together so you don't have to be "gumby" trying to get your hands on the top side of the CV's to tie them together.